diff options
| -rw-r--r-- | tests/Android.mk | 8 | ||||
| -rw-r--r-- | tests/component/update_verifier_test.cpp | 9 | ||||
| -rw-r--r-- | update_verifier/Android.mk | 8 | ||||
| -rw-r--r-- | update_verifier/update_verifier.cpp | 45 |
4 files changed, 22 insertions, 48 deletions
diff --git a/tests/Android.mk b/tests/Android.mk index b29ff50f6..fd4497858 100644 --- a/tests/Android.mk +++ b/tests/Android.mk @@ -74,14 +74,6 @@ ifeq ($(AB_OTA_UPDATER),true) LOCAL_CFLAGS += -DAB_OTA_UPDATER=1 endif -ifeq ($(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VERITY),true) -LOCAL_CFLAGS += -DPRODUCT_SUPPORTS_VERITY=1 -endif - -ifeq ($(BOARD_AVB_ENABLE),true) -LOCAL_CFLAGS += -DBOARD_AVB_ENABLE=1 -endif - LOCAL_MODULE := recovery_component_test LOCAL_COMPATIBILITY_SUITE := device-tests LOCAL_C_INCLUDES := bootable/recovery diff --git a/tests/component/update_verifier_test.cpp b/tests/component/update_verifier_test.cpp index 1544bb2a4..f6ef6dcfd 100644 --- a/tests/component/update_verifier_test.cpp +++ b/tests/component/update_verifier_test.cpp @@ -17,6 +17,8 @@ #include <string> #include <android-base/file.h> +#include <android-base/properties.h> +#include <android-base/strings.h> #include <android-base/test_utils.h> #include <gtest/gtest.h> #include <update_verifier/update_verifier.h> @@ -24,11 +26,8 @@ class UpdateVerifierTest : public ::testing::Test { protected: void SetUp() override { -#if defined(PRODUCT_SUPPORTS_VERITY) || defined(BOARD_AVB_ENABLE) - verity_supported = true; -#else - verity_supported = false; -#endif + std::string verity_mode = android::base::GetProperty("ro.boot.veritymode", ""); + verity_supported = android::base::EqualsIgnoreCase(verity_mode, "enforcing"); } bool verity_supported; diff --git a/update_verifier/Android.mk b/update_verifier/Android.mk index 0ff88546f..8d61cd101 100644 --- a/update_verifier/Android.mk +++ b/update_verifier/Android.mk @@ -39,14 +39,6 @@ LOCAL_EXPORT_C_INCLUDE_DIRS := \ LOCAL_C_INCLUDES := \ $(LOCAL_PATH)/include -ifeq ($(PRODUCTS.$(INTERNAL_PRODUCT).PRODUCT_SUPPORTS_VERITY),true) -LOCAL_CFLAGS += -DPRODUCT_SUPPORTS_VERITY=1 -endif - -ifeq ($(BOARD_AVB_ENABLE),true) -LOCAL_CFLAGS += -DBOARD_AVB_ENABLE=1 -endif - include $(BUILD_STATIC_LIBRARY) # update_verifier (executable) diff --git a/update_verifier/update_verifier.cpp b/update_verifier/update_verifier.cpp index 92d931371..dc7276326 100644 --- a/update_verifier/update_verifier.cpp +++ b/update_verifier/update_verifier.cpp @@ -15,24 +15,26 @@ */ /* - * This program verifies the integrity of the partitions after an A/B OTA - * update. It gets invoked by init, and will only perform the verification if - * it's the first boot post an A/B OTA update. + * update_verifier verifies the integrity of the partitions after an A/B OTA update. It gets invoked + * by init, and will only perform the verification if it's the first boot post an A/B OTA update + * (https://source.android.com/devices/tech/ota/ab/#after_reboot). * - * Update_verifier relies on dm-verity to capture any corruption on the partitions - * being verified. And its behavior varies depending on the dm-verity mode. - * Upon detection of failures: + * update_verifier relies on device-mapper-verity (dm-verity) to capture any corruption on the + * partitions being verified (https://source.android.com/security/verifiedboot). The verification + * will be skipped, if dm-verity is not enabled on the device. + * + * Upon detecting verification failures, the device will be rebooted, although the trigger of the + * reboot depends on the dm-verity mode. * enforcing mode: dm-verity reboots the device * eio mode: dm-verity fails the read and update_verifier reboots the device * other mode: not supported and update_verifier reboots the device * - * After a predefined number of failing boot attempts, the bootloader should - * mark the slot as unbootable and stops trying. Other dm-verity modes ( - * for example, veritymode=EIO) are not accepted and simply lead to a - * verification failure. + * All these reboots prevent the device from booting into a known corrupt state. If the device + * continuously fails to boot into the new slot, the bootloader should mark the slot as unbootable + * and trigger a fallback to the old slot. * - * The current slot will be marked as having booted successfully if the - * verifier reaches the end after the verification. + * The current slot will be marked as having booted successfully if the verifier reaches the end + * after the verification. */ #include "update_verifier/update_verifier.h" @@ -103,12 +105,10 @@ static bool read_blocks(const std::string& partition, const std::string& range_s PLOG(WARNING) << "Failed to read " << path; } else { std::string dm_block_name = android::base::Trim(content); -#ifdef BOARD_AVB_ENABLE // AVB is using 'vroot' for the root block device but we're expecting 'system'. if (dm_block_name == "vroot") { dm_block_name = "system"; } -#endif if (dm_block_name == partition) { dm_block_device = DEV_PATH + std::string(namelist[n]->d_name); while (n--) { @@ -264,19 +264,13 @@ int update_verifier(int argc, char** argv) { if (is_successful == BoolResult::FALSE) { // The current slot has not booted successfully. -#if defined(PRODUCT_SUPPORTS_VERITY) || defined(BOARD_AVB_ENABLE) bool skip_verification = false; std::string verity_mode = android::base::GetProperty("ro.boot.veritymode", ""); if (verity_mode.empty()) { - // With AVB it's possible to disable verification entirely and - // in this case ro.boot.veritymode is empty. -#if defined(BOARD_AVB_ENABLE) - LOG(WARNING) << "verification has been disabled; marking without verification."; + // Skip the verification if ro.boot.veritymode property is not set. This could be a result + // that device doesn't support dm-verity, or has disabled that. + LOG(WARNING) << "dm-verity not enabled; marking without verification."; skip_verification = true; -#else - LOG(ERROR) << "Failed to get dm-verity mode."; - return reboot_device(); -#endif } else if (android::base::EqualsIgnoreCase(verity_mode, "eio")) { // We shouldn't see verity in EIO mode if the current slot hasn't booted successfully before. // Continue the verification until we fail to read some blocks. @@ -285,7 +279,7 @@ int update_verifier(int argc, char** argv) { LOG(WARNING) << "dm-verity in disabled mode; marking without verification."; skip_verification = true; } else if (verity_mode != "enforcing") { - LOG(ERROR) << "Unexpected dm-verity mode : " << verity_mode << ", expecting enforcing."; + LOG(ERROR) << "Unexpected dm-verity mode: " << verity_mode << ", expecting enforcing."; return reboot_device(); } @@ -296,9 +290,6 @@ int update_verifier(int argc, char** argv) { return reboot_device(); } } -#else - LOG(WARNING) << "dm-verity not enabled; marking without verification."; -#endif CommandResult cr; module->markBootSuccessful([&cr](CommandResult result) { cr = result; }); |